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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 1998-2014, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: ustr_cnv.cpp
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 2004aug24
* created by: Markus W. Scherer
*
* Character conversion functions moved here from ustring.c
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_CONVERSION
#include "unicode/ustring.h"
#include "unicode/ucnv.h"
#include "cstring.h"
#include "cmemory.h"
#include "umutex.h"
#include "ustr_cnv.h"
#include "ucnv_bld.h"
/* mutexed access to a shared default converter ----------------------------- */
static UConverter *gDefaultConverter = nullptr;
U_CAPI UConverter* U_EXPORT2
u_getDefaultConverter(UErrorCode *status)
{
UConverter *converter = nullptr;
if (gDefaultConverter != nullptr) {
icu::umtx_lock(nullptr);
/* need to check to make sure it wasn't taken out from under us */
if (gDefaultConverter != nullptr) {
converter = gDefaultConverter;
gDefaultConverter = nullptr;
}
icu::umtx_unlock(nullptr);
}
/* if the cache was empty, create a converter */
if(converter == nullptr) {
converter = ucnv_open(nullptr, status);
if(U_FAILURE(*status)) {
ucnv_close(converter);
converter = nullptr;
}
}
return converter;
}
U_CAPI void U_EXPORT2
u_releaseDefaultConverter(UConverter *converter)
{
if(gDefaultConverter == nullptr) {
if (converter != nullptr) {
ucnv_reset(converter);
}
ucnv_enableCleanup();
icu::umtx_lock(nullptr);
if(gDefaultConverter == nullptr) {
gDefaultConverter = converter;
converter = nullptr;
}
icu::umtx_unlock(nullptr);
}
if(converter != nullptr) {
ucnv_close(converter);
}
}
U_CAPI void U_EXPORT2
u_flushDefaultConverter()
{
UConverter *converter = nullptr;
if (gDefaultConverter != nullptr) {
icu::umtx_lock(nullptr);
/* need to check to make sure it wasn't taken out from under us */
if (gDefaultConverter != nullptr) {
converter = gDefaultConverter;
gDefaultConverter = nullptr;
}
icu::umtx_unlock(nullptr);
}
/* if the cache was populated, flush it */
if(converter != nullptr) {
ucnv_close(converter);
}
}
/* conversions between char* and char16_t* ------------------------------------- */
/* maximum string length for u_uastrcpy() and u_austrcpy() implementations */
#define MAX_STRLEN 0x0FFFFFFF
/*
returns the minimum of (the length of the null-terminated string) and n.
*/
static int32_t u_astrnlen(const char *s1, int32_t n)
{
int32_t len = 0;
if (s1)
{
while (n-- && *(s1++))
{
len++;
}
}
return len;
}
U_CAPI char16_t* U_EXPORT2
u_uastrncpy(char16_t *ucs1,
const char *s2,
int32_t n)
{
char16_t *target = ucs1;
UErrorCode err = U_ZERO_ERROR;
UConverter *cnv = u_getDefaultConverter(&err);
if(U_SUCCESS(err) && cnv != nullptr) {
ucnv_reset(cnv);
ucnv_toUnicode(cnv,
&target,
ucs1+n,
&s2,
s2+u_astrnlen(s2, n),
nullptr,
true,
&err);
ucnv_reset(cnv); /* be good citizens */
u_releaseDefaultConverter(cnv);
if(U_FAILURE(err) && (err != U_BUFFER_OVERFLOW_ERROR) ) {
*ucs1 = 0; /* failure */
}
if(target < (ucs1+n)) { /* U_BUFFER_OVERFLOW_ERROR isn't an err, just means no termination will happen. */
*target = 0; /* terminate */
}
} else {
*ucs1 = 0;
}
return ucs1;
}
U_CAPI char16_t* U_EXPORT2
u_uastrcpy(char16_t *ucs1,
const char *s2 )
{
UErrorCode err = U_ZERO_ERROR;
UConverter *cnv = u_getDefaultConverter(&err);
if(U_SUCCESS(err) && cnv != nullptr) {
ucnv_toUChars(cnv,
ucs1,
MAX_STRLEN,
s2,
(int32_t)uprv_strlen(s2),
&err);
u_releaseDefaultConverter(cnv);
if(U_FAILURE(err)) {
*ucs1 = 0;
}
} else {
*ucs1 = 0;
}
return ucs1;
}
/*
returns the minimum of (the length of the null-terminated string) and n.
*/
static int32_t u_ustrnlen(const char16_t *ucs1, int32_t n)
{
int32_t len = 0;
if (ucs1)
{
while (n-- && *(ucs1++))
{
len++;
}
}
return len;
}
U_CAPI char* U_EXPORT2
u_austrncpy(char *s1,
const char16_t *ucs2,
int32_t n)
{
char *target = s1;
UErrorCode err = U_ZERO_ERROR;
UConverter *cnv = u_getDefaultConverter(&err);
if(U_SUCCESS(err) && cnv != nullptr) {
ucnv_reset(cnv);
ucnv_fromUnicode(cnv,
&target,
s1+n,
&ucs2,
ucs2+u_ustrnlen(ucs2, n),
nullptr,
true,
&err);
ucnv_reset(cnv); /* be good citizens */
u_releaseDefaultConverter(cnv);
if(U_FAILURE(err) && (err != U_BUFFER_OVERFLOW_ERROR) ) {
*s1 = 0; /* failure */
}
if(target < (s1+n)) { /* U_BUFFER_OVERFLOW_ERROR isn't an err, just means no termination will happen. */
*target = 0; /* terminate */
}
} else {
*s1 = 0;
}
return s1;
}
U_CAPI char* U_EXPORT2
u_austrcpy(char *s1,
const char16_t *ucs2 )
{
UErrorCode err = U_ZERO_ERROR;
UConverter *cnv = u_getDefaultConverter(&err);
if(U_SUCCESS(err) && cnv != nullptr) {
int32_t len = ucnv_fromUChars(cnv,
s1,
MAX_STRLEN,
ucs2,
-1,
&err);
u_releaseDefaultConverter(cnv);
s1[len] = 0;
} else {
*s1 = 0;
}
return s1;
}
#endif
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